Emerson EC2-311 Operating Instructions

Note: This document contains short form instructions for experienced users.
Use last column in List of Parameters to document your individual settings.
More detailed information can be found in the User Manual.
The EC2-311 is a dedicated refrigeration controller with superheat control and a
driver for an Alco Controls Electric Control Valve EX2. In addition the EC2-311
controls air temperature and manages defrost and fan(s).
6
7
Two ECN-Pxx pipe temperature sensors (1) and (2) measure saturated suction gas
temperatures at the evaporator inlet and outlet and feed the signals into the
superheat control loop. The superheat controller output modulates the opening of
the EX2 pulse width modulated Electrical Control Valve (6) thus optimising the
refrigerant mass flow through the evaporator. The ECN-Sxx air temperature
sensors (3) and (4) measure air-in and air-out temperature of the evaporator and
feed signals into the air temperature thermostat. The ECN-Fxx fin sensor (5) is
used for defrost termination. The controller has 3 relay outputs to control the
compressor (7), defrost heater (9) and evaporator fan (8). Please consult the
technical data (right) for input and output ratings.
In case of power loss, due to the positive shut-off characteristics of the EX2
Electrical Control Valves, a liquid line solenoid valve is not needed to prevent
flooding of the compressor.
!
Safety instructions:
Read installation instructions thoroughly. Failure to comply can result in
•
device failure, system damage or personal injury.
The product is intended for use by persons having the appropriate
•
knowledge and skills.
Ensure electrical ratings per technical data are not exceeded.
•
Disconnect all voltages from system before installation.
•
Keep temperatures within nominal limits.
•
Comply with local electrical regulations when wiring
•
EC2-311_65081_EN_R08.doc
EC2-311 Display Case and Coldroom Controller
Network
4
8
5 1
2
3
9
Replacement for Rev.:06
Operating Instructions
Technical Data
EC2 Series Controller
Power supply
Power consumption
Communication
Plug-in connector size
Temperature
storage
operating
Humidity
Protection class
Output relays
Triac output for EX2
Electrical Control Valve
Coil (ASC 24V only)
Marking
Mounting
The EC2-311 can be mounted in panels with a 71 x
29 mm cutout. See dimensional drawing below for
space requirements including rear connectors.
Push controller into panel cutout.(1)
Make sure that mounting lugs are flush with outside
of controller housing
Insert allen key into front panel holes and turn
clockwise. Mounting lugs will turn and gradually
move towards panel (2)
Turn allen key until mounting lug barely touches
panel. Then move other mounting lug to the same
position (3)
Tighten both sides very carefully until controller is
secured. Do not over tighten as mounting lugs will
break easily.

Electrical Installation

Refer to the electrical wiring diagram (below) for electrical connections. A copy of
this diagram is labeled on the controller. Use connection wires/cables suitable for
90°C operation (EN 60730-1)
EC2 analog inputs are for dedicated sensors only and should not be connected to
any other devices. Connecting any EC2 inputs to mains voltage will permanently
damage the EC2.
Important: Keep controller and sensor wiring well separated from mains wiring.
Minimum recommended distance 30mm.
Warning: Use a class II category transformer for 24VAC power supply
(EN 61558). Do not ground the 24VAC lines. We recommend to use one
transformer per EC2 controller and to use separate transformers for 3
controllers, to avoid possible interference or grounding problems in the power
supply. Connecting any EC2 inputs to mains voltage will permanently damage the
EC2.
1 / 4
24VAC ±10%; 50/60 Hz; Class II
20VA max including EX2.
LonWorks® Interface, FTT10, RJ45 connector
Removable screw terminals
2
wire size 0.14 ... 1.5mm
-20 ... +65°C
0 ... +60°C
0...80% r.h. non condensing
IP65 (front protection with gasket)
(3) SPDT contacts, AgCdO
Inductive (AC15) 250V/2A
Resistive (AC1) 250V/8A; 12A total return current
24VAC, 0.1 ... 1A
PCN: 864 911 20.03.2008
GB
rd
party